Eye Need To Know: Stereo Testing And Polarized Glasses

Stereopsis refers to our ability to appreciate depth, or to distinguish the physical distance between objects. Without depth perception it is difficult to pour water into a glass from a pitcher, appreciate a 3D movie and parallel park a car. An Example: The Stereo Fly Test from Stereo Optical is used to evaluate both gross and fine stereo vision.

A person taking a Stereo Test with polarized glasses will report that the objects look closer to them if they have normal binocular vision.

Question: What do you suppose happens if you turn the test book upside down?